Malicious PDF — malware analysis report

Static analysis result for SHA-256 481cbda389cd911f…

MALICIOUS

PDF

84.0 KB Created: 2021-01-29 06:44:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f8b14917b747260742abc7a486c07594 SHA-1: d9530a1764eb1ebbd02dc56b76f2cea3d6e72c83 SHA-256: 481cbda389cd911f64319a34dd6156d142f8ceff8df75225dfe7dbda0c2586d7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many pointing to PDF files hosted on file-sharing services, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these linked documents. No scripts were extracted, and the document body was heavily obfuscated, preventing a more detailed analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/aws?utm_term=edit+profile+page+template+bootstrap+4 PDF link annotation
    • https://sizamuvexiluti.weebly.com/uploads/1/3/4/6/134644091/vojoxetuzuvipop.pdfIn PDF document text
    • https://werudugin.weebly.com/uploads/1/3/0/8/130873895/6863425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383806/normal_5fe8127b23021.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470688/normal_6008a67f7aba0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381539/normal_5ffdfdd806588.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxuduxexi/jhek3ii/vanomosut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413118/normal_5ff5a9aec9e30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473379/normal_5ff3913fdbb3d.pdfIn PDF document text
    • https://gifenatewa.weebly.com/uploads/1/3/4/4/134480542/2605606.pdfIn PDF document text
    • https://cdn.sqhk.co/gajerivab/ijhjhb5/wogijewasolonumozura.pdfIn PDF document text
    • https://cdn.sqhk.co/zafazegig/lhbigha/zombie_shoot_pandemic_survivor_mod_apk_terbaru.pdfIn PDF document text
    • https://wavasifowimuzog.weebly.com/uploads/1/3/5/3/135321241/505ae.pdfIn PDF document text
    • https://tegipogelow.weebly.com/uploads/1/3/1/4/131407588/2530688.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pigibotokaper.epizy.com/photoshop_animation_psd.pdfIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/stored_cross_site_scripting_cheat_sheet.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7E 5544 bytes
SHA-256: 0854de42476436b7ebe45fcee67040217aecc0bd4ce0e2216ca61144e138fa9a
font_01_sfnt_off00012047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12047 10160 bytes
SHA-256: d7a385d896068707c4e30167a00e943904f722213896ca7f54a384f2bddbe12d

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